/*
 * %W% %E%
 *
 * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.swing.plaf.basic;

import java.awt.*;
import java.awt.event.*;
import java.text.ParseException;

import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
import javax.swing.plaf.*;
import javax.swing.text.*;

import java.beans.*;
import java.text.*;
import java.util.*;
import sun.swing.DefaultLookup;


/**
 * The default Spinner UI delegate.
 *
 * @version %I% %G%
 * @author Hans Muller
 * @since 1.4
 */
public class BasicSpinnerUI extends SpinnerUI
{
    /**
     * The spinner that we're a UI delegate for.  Initialized by 
     * the <code>installUI</code> method, and reset to null
     * by <code>uninstallUI</code>.
     * 
     * @see #installUI
     * @see #uninstallUI
     */
    protected JSpinner spinner;  
    private Handler handler;


    /**
     * The mouse/action listeners that are added to the spinner's 
     * arrow buttons.  These listeners are shared by all 
     * spinner arrow buttons.
     * 
     * @see #createNextButton
     * @see #createPreviousButton
     */
    private static final ArrowButtonHandler nextButtonHandler = new ArrowButtonHandler("increment", true);
    private static final ArrowButtonHandler previousButtonHandler = new ArrowButtonHandler("decrement", false);
    private PropertyChangeListener propertyChangeListener;


    /**
     * Used by the default LayoutManager class - SpinnerLayout for 
     * missing (null) editor/nextButton/previousButton children.
     */
    private static final Dimension zeroSize = new Dimension(0, 0);


    /**
     * Returns a new instance of BasicSpinnerUI.  SpinnerListUI 
     * delegates are allocated one per JSpinner.  
     * 
     * @param c the JSpinner (not used)
     * @see ComponentUI#createUI
     * @return a new BasicSpinnerUI object
     */
    public static ComponentUI createUI(JComponent c) {
        return new BasicSpinnerUI();
    }


    private void maybeAdd(Component c, String s) {
	if (c != null) {
	    spinner.add(c, s);
	}
    }


    /**
     * Calls <code>installDefaults</code>, <code>installListeners</code>,
     * and then adds the components returned by <code>createNextButton</code>,
     * <code>createPreviousButton</code>, and <code>createEditor</code>.
     * 
     * @param c the JSpinner
     * @see #installDefaults
     * @see #installListeners
     * @see #createNextButton
     * @see #createPreviousButton
     * @see #createEditor
     */
    public void installUI(JComponent c) {
	this.spinner = (JSpinner)c;
	installDefaults();
	installListeners();
	maybeAdd(createNextButton(), "Next");
	maybeAdd(createPreviousButton(), "Previous");
	maybeAdd(createEditor(), "Editor");
        updateEnabledState();
        installKeyboardActions();
    }


    /**
     * Calls <code>uninstallDefaults</code>, <code>uninstallListeners</code>,
     * and then removes all of the spinners children.
     * 
     * @param c the JSpinner (not used)
     */
    public void uninstallUI(JComponent c) {
	uninstallDefaults();
	uninstallListeners();
	this.spinner = null;
	c.removeAll();
    }

    
    /**
     * Initializes <code>PropertyChangeListener</code> with 
     * a shared object that delegates interesting PropertyChangeEvents
     * to protected methods.
     * <p>
     * This method is called by <code>installUI</code>.
     * 
     * @see #replaceEditor
     * @see #uninstallListeners
     */
    protected void installListeners() {
        propertyChangeListener = createPropertyChangeListener();
        spinner.addPropertyChangeListener(propertyChangeListener);
	if (DefaultLookup.getBoolean(spinner, this,
	    "Spinner.disableOnBoundaryValues", false)) {
	    spinner.addChangeListener(getHandler());
	}
	JComponent editor = spinner.getEditor();
	if (editor != null && editor instanceof JSpinner.DefaultEditor) {
	    JTextField tf = ((JSpinner.DefaultEditor)editor).getTextField();
	    if (tf != null) {
		tf.addFocusListener(nextButtonHandler);
		tf.addFocusListener(previousButtonHandler);
	    }
	}
    }


    /**
     * Removes the <code>PropertyChangeListener</code> added
     * by installListeners.
     * <p>
     * This method is called by <code>uninstallUI</code>.
     * 
     * @see #installListeners
     */
    protected void uninstallListeners() {
	spinner.removePropertyChangeListener(propertyChangeListener);
	spinner.removeChangeListener(handler);
	JComponent editor = spinner.getEditor();
	removeEditorBorderListener(editor);
	if (editor instanceof JSpinner.DefaultEditor) {
	    JTextField tf = ((JSpinner.DefaultEditor)editor).getTextField();
	    if (tf != null) {
		tf.removeFocusListener(nextButtonHandler);
		tf.removeFocusListener(previousButtonHandler);
	    }
	}
        propertyChangeListener = null;
        handler = null;
    }


    /**
     * Initialize the <code>JSpinner</code> <code>border</code>, 
     * <code>foreground</code>, and <code>background</code>, properties 
     * based on the corresponding "Spinner.*" properties from defaults table.  
     * The <code>JSpinners</code> layout is set to the value returned by
     * <code>createLayout</code>.  This method is called by <code>installUI</code>.
     *
     * @see #uninstallDefaults
     * @see #installUI
     * @see #createLayout
     * @see LookAndFeel#installBorder
     * @see LookAndFeel#installColors
     */
    protected void installDefaults() {
	spinner.setLayout(createLayout());
        LookAndFeel.installBorder(spinner, "Spinner.border");
        LookAndFeel.installColorsAndFont(spinner, "Spinner.background", "Spinner.foreground", "Spinner.font");
        LookAndFeel.installProperty(spinner, "opaque", Boolean.TRUE);
    }


    /**
     * Sets the <code>JSpinner's</code> layout manager to null.  This
     * method is called by <code>uninstallUI</code>.
     * 
     * @see #installDefaults
     * @see #uninstallUI
     */
    protected void uninstallDefaults() {
	spinner.setLayout(null);
    }


    private Handler getHandler() {
        if (handler == null) {
            handler = new Handler();
        }
        return handler;
    }


    /**
     * Installs the necessary listeners on the next button, <code>c</code>,
     * to update the <code>JSpinner</code> in response to a user gesture.
     *
     * @param c Component to install the listeners on
     * @throws NullPointerException if <code>c</code> is null.
     * @see #createNextButton
     * @since 1.5
     */
    protected void installNextButtonListeners(Component c) {
        installButtonListeners(c, nextButtonHandler);
    }

    /**
     * Installs the necessary listeners on the previous button, <code>c</code>,
     * to update the <code>JSpinner</code> in response to a user gesture.
     *
     * @param c Component to install the listeners on.
     * @throws NullPointerException if <code>c</code> is null.
     * @see #createPreviousButton
     * @since 1.5
     */
    protected void installPreviousButtonListeners(Component c) {
        installButtonListeners(c, previousButtonHandler);
    }

    private void installButtonListeners(Component c,
                                        ArrowButtonHandler handler) {
        if (c instanceof JButton) {
            ((JButton)c).addActionListener(handler);
        }
        c.addMouseListener(handler);
    }

    /**
     * Create a <code>LayoutManager</code> that manages the <code>editor</code>, 
     * <code>nextButton</code>, and <code>previousButton</code> 
     * children of the JSpinner.  These three children must be
     * added with a constraint that identifies their role: 
     * "Editor", "Next", and "Previous". The default layout manager 
     * can handle the absence of any of these children.
     * 
     * @return a LayoutManager for the editor, next button, and previous button.
     * @see #createNextButton
     * @see #createPreviousButton
     * @see #createEditor
     */
    protected LayoutManager createLayout() {
        return getHandler();
    }


    /**
     * Create a <code>PropertyChangeListener</code> that can be
     * added to the JSpinner itself.  Typically, this listener
     * will call replaceEditor when the "editor" property changes, 
     * since it's the <code>SpinnerUI's</code> responsibility to 
     * add the editor to the JSpinner (and remove the old one).
     * This method is called by <code>installListeners</code>.
     * 
     * @return A PropertyChangeListener for the JSpinner itself
     * @see #installListeners
     */
    protected PropertyChangeListener createPropertyChangeListener() {
        return getHandler();
    }


    /**
     * Create a component that will replace the spinner models value
     * with the object returned by <code>spinner.getPreviousValue</code>.
     * By default the <code>previousButton</code> is a JButton. This
     * method invokes <code>installPreviousButtonListeners</code> to
     * install the necessary listeners to update the <code>JSpinner</code>'s
     * model in response to a user gesture. If a previousButton isn't needed
     * (in a subclass) then override this method to return null.
     *
     * @return a component that will replace the spinners model with the
     *     next value in the sequence, or null
     * @see #installUI
     * @see #createNextButton
     * @see #installPreviousButtonListeners
     */
    protected Component createPreviousButton() {
	Component c = createArrowButton(SwingConstants.SOUTH);
        c.setName("Spinner.previousButton");
        installPreviousButtonListeners(c);
        return c;
    }


    /**
     * Create a component that will replace the spinner models value
     * with the object returned by <code>spinner.getNextValue</code>.
     * By default the <code>nextButton</code> is a JButton
     * who's <code>ActionListener</code> updates it's <code>JSpinner</code>
     * ancestors model.  If a nextButton isn't needed (in a subclass)
     * then override this method to return null.
     *
     * @return a component that will replace the spinners model with the
     *     next value in the sequence, or null
     * @see #installUI
     * @see #createPreviousButton
     * @see #installNextButtonListeners
     */
    protected Component createNextButton() {
	Component c = createArrowButton(SwingConstants.NORTH);
        c.setName("Spinner.nextButton");
        installNextButtonListeners(c);
        return c;
    }

    private Component createArrowButton(int direction) {
	JButton b = new BasicArrowButton(direction);
	Border buttonBorder = UIManager.getBorder("Spinner.arrowButtonBorder");
	if (buttonBorder instanceof UIResource) {
	    // Wrap the border to avoid having the UIResource be replaced by
	    // the ButtonUI. This is the opposite of using BorderUIResource.
	    b.setBorder(new CompoundBorder(buttonBorder, null));
	} else {
	    b.setBorder(buttonBorder);
	}
        b.setInheritsPopupMenu(true);
	return b;
    }


    /**
     * This method is called by installUI to get the editor component
     * of the <code>JSpinner</code>.  By default it just returns 
     * <code>JSpinner.getEditor()</code>.  Subclasses can override
     * <code>createEditor</code> to return a component that contains 
     * the spinner's editor or null, if they're going to handle adding 
     * the editor to the <code>JSpinner</code> in an 
     * <code>installUI</code> override.
     * <p>
     * Typically this method would be overridden to wrap the editor
     * with a container with a custom border, since one can't assume
     * that the editors border can be set directly.  
     * <p>
     * The <code>replaceEditor</code> method is called when the spinners
     * editor is changed with <code>JSpinner.setEditor</code>.  If you've
     * overriden this method, then you'll probably want to override
     * <code>replaceEditor</code> as well.
     * 
     * @return the JSpinners editor JComponent, spinner.getEditor() by default
     * @see #installUI
     * @see #replaceEditor
     * @see JSpinner#getEditor
     */
    protected JComponent createEditor() {
	JComponent editor = spinner.getEditor();
	maybeRemoveEditorBorder(editor);
	installEditorBorderListener(editor);
        editor.setInheritsPopupMenu(true);
        updateEditorAlignment(editor);
        return editor;
    }


    /**
     * Called by the <code>PropertyChangeListener</code> when the 
     * <code>JSpinner</code> editor property changes.  It's the responsibility 
     * of this method to remove the old editor and add the new one.  By
     * default this operation is just:
     * <pre>
     * spinner.remove(oldEditor);
     * spinner.add(newEditor, "Editor");
     * </pre>
     * The implementation of <code>replaceEditor</code> should be coordinated
     * with the <code>createEditor</code> method.
     * 
     * @see #createEditor
     * @see #createPropertyChangeListener
     */
    protected void replaceEditor(JComponent oldEditor, JComponent newEditor) {
	spinner.remove(oldEditor);
	maybeRemoveEditorBorder(newEditor);
	installEditorBorderListener(newEditor);
        newEditor.setInheritsPopupMenu(true);
        updateEditorAlignment(newEditor);
	spinner.add(newEditor, "Editor");
    }

    private void updateEditorAlignment(JComponent editor) {
        if (editor instanceof JSpinner.DefaultEditor) {
            // if editor alignment isn't set in LAF, we get 0 (CENTER) here
            int alignment = UIManager.getInt("Spinner.editorAlignment");
            JTextField text = ((JSpinner.DefaultEditor)editor).getTextField();
            text.setHorizontalAlignment(alignment);
        }
    }
    
    /**
     * Remove the border around the inner editor component for LaFs
     * that install an outside border around the spinner,
     */
    private void maybeRemoveEditorBorder(JComponent editor) {
        if (!UIManager.getBoolean("Spinner.editorBorderPainted")) {
	    if (editor instanceof JPanel &&
		editor.getBorder() == null &&
		editor.getComponentCount() > 0) {

		editor = (JComponent)editor.getComponent(0);
	    }

	    if (editor != null && editor.getBorder() instanceof UIResource) {
		editor.setBorder(null);
	    }
	}
    }

    /**
     * Remove the border around the inner editor component for LaFs
     * that install an outside border around the spinner,
     */
    private void installEditorBorderListener(JComponent editor) {
        if (!UIManager.getBoolean("Spinner.editorBorderPainted")) {
	    if (editor instanceof JPanel &&
		editor.getBorder() == null &&
		editor.getComponentCount() > 0) {

		editor = (JComponent)editor.getComponent(0);
	    }
	    if (editor != null &&
		(editor.getBorder() == null ||
		 editor.getBorder() instanceof UIResource)) {
		editor.addPropertyChangeListener(getHandler());
	    }
	}
    }

    private void removeEditorBorderListener(JComponent editor) {
        if (!UIManager.getBoolean("Spinner.editorBorderPainted")) {
	    if (editor instanceof JPanel &&
		editor.getComponentCount() > 0) {

		editor = (JComponent)editor.getComponent(0);
	    }
	    if (editor != null) {
		editor.removePropertyChangeListener(getHandler());
	    }
	}
    }


    /**
     * Updates the enabled state of the children Components based on the
     * enabled state of the <code>JSpinner</code>.
     */
    private void updateEnabledState() {
        updateEnabledState(spinner, spinner.isEnabled());
    }


    /**
     * Recursively updates the enabled state of the child
     * <code>Component</code>s of <code>c</code>.
     */
    private void updateEnabledState(Container c, boolean enabled) {
        for (int counter = c.getComponentCount() - 1; counter >= 0;counter--) {
            Component child = c.getComponent(counter);

	    if (DefaultLookup.getBoolean(spinner, this,
		"Spinner.disableOnBoundaryValues", false)) {
 		SpinnerModel model = spinner.getModel();
 		if (child.getName() == "Spinner.nextButton" &&
		    model.getNextValue() == null) {
 		    child.setEnabled(false);
 		}
 		else if (child.getName() == "Spinner.previousButton" &&
			 model.getPreviousValue() == null) {
 		    child.setEnabled(false);
 		}
 		else {
 		    child.setEnabled(enabled);
 		}
 	    }
	    else {
		child.setEnabled(enabled);
	    }
            if (child instanceof Container) {
                updateEnabledState((Container)child, enabled);
            }
        }
    }


    /**
     * Installs the keyboard Actions onto the JSpinner.
     *
     * @since 1.5
     */
    protected void installKeyboardActions() {
        InputMap iMap = getInputMap(JComponent.
                                   WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);

	SwingUtilities.replaceUIInputMap(spinner, JComponent.
					 WHEN_ANCESTOR_OF_FOCUSED_COMPONENT,
					 iMap);

        LazyActionMap.installLazyActionMap(spinner, BasicSpinnerUI.class,
                "Spinner.actionMap");
    }

    /**
     * Returns the InputMap to install for <code>condition</code>.
     */
    private InputMap getInputMap(int condition) {
        if (condition == JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT) {
	    return (InputMap)DefaultLookup.get(spinner, this,
                    "Spinner.ancestorInputMap");
        }
        return null;
    }

    static void loadActionMap(LazyActionMap map) {
        map.put("increment", nextButtonHandler);
        map.put("decrement", previousButtonHandler);
    }

    /**
     * Returns the baseline.
     *
     * @throws NullPointerException {@inheritDoc}
     * @throws IllegalArgumentException {@inheritDoc}
     * @see javax.swing.JComponent#getBaseline(int, int)
     * @since 1.6
     */
    public int getBaseline(JComponent c, int width, int height) {
        super.getBaseline(c, width, height);
        JComponent editor = spinner.getEditor();
        Insets insets = spinner.getInsets();
        width = width - insets.left - insets.right;
        height = height - insets.top - insets.bottom;
        if (width >= 0 && height >= 0) {
            int baseline = editor.getBaseline(width, height);
            if (baseline >= 0) {
                return insets.top + baseline;
            }
        }
        return -1;
    }

    /**
     * Returns an enum indicating how the baseline of the component
     * changes as the size changes.
     *
     * @throws NullPointerException {@inheritDoc}
     * @see javax.swing.JComponent#getBaseline(int, int)
     * @since 1.6
     */
    public Component.BaselineResizeBehavior getBaselineResizeBehavior(
            JComponent c) {
        super.getBaselineResizeBehavior(c);
        return spinner.getEditor().getBaselineResizeBehavior();
    }

    /**
     * A handler for spinner arrow button mouse and action events.  When 
     * a left mouse pressed event occurs we look up the (enabled) spinner 
     * that's the source of the event and start the autorepeat timer.  The
     * timer fires action events until any button is released at which 
     * point the timer is stopped and the reference to the spinner cleared.
     * The timer doesn't start until after a 300ms delay, so often the 
     * source of the initial (and final) action event is just the button
     * logic for mouse released - which means that we're relying on the fact
     * that our mouse listener runs after the buttons mouse listener.
     * <p>
     * Note that one instance of this handler is shared by all slider previous 
     * arrow buttons and likewise for all of the next buttons, 
     * so it doesn't have any state that persists beyond the limits
     * of a single button pressed/released gesture.
     */
    private static class ArrowButtonHandler extends AbstractAction
					    implements FocusListener, MouseListener, UIResource {
	final javax.swing.Timer autoRepeatTimer;
	final boolean isNext;
	JSpinner spinner = null;
 	JButton arrowButton = null;

	ArrowButtonHandler(String name, boolean isNext) {
            super(name);
	    this.isNext = isNext;
	    autoRepeatTimer = new javax.swing.Timer(60, this);
	    autoRepeatTimer.setInitialDelay(300);
	}

	private JSpinner eventToSpinner(AWTEvent e) {
	    Object src = e.getSource();
	    while ((src instanceof Component) && !(src instanceof JSpinner)) {
		src = ((Component)src).getParent();
	    }
	    return (src instanceof JSpinner) ? (JSpinner)src : null;
	}

	public void actionPerformed(ActionEvent e) {
            JSpinner spinner = this.spinner;

            if (!(e.getSource() instanceof javax.swing.Timer)) {
                // Most likely resulting from being in ActionMap.
                spinner = eventToSpinner(e);
		if (e.getSource() instanceof JButton) {
		    arrowButton = (JButton)e.getSource();
		}
	    } else {
  		if (arrowButton!=null && !arrowButton.getModel().isPressed()
		    && autoRepeatTimer.isRunning()) {
  		    autoRepeatTimer.stop();
  		    spinner = null;
		    arrowButton = null;
  		}
	    }
            if (spinner != null) {
                try {
                    int calendarField = getCalendarField(spinner);
                    spinner.commitEdit();
                    if (calendarField != -1) {
                        ((SpinnerDateModel)spinner.getModel()).
                                 setCalendarField(calendarField);
                    }
                    Object value = (isNext) ? spinner.getNextValue() :
                               spinner.getPreviousValue();
                    if (value != null) {
                        spinner.setValue(value);
                        select(spinner);
                    }
                } catch (IllegalArgumentException iae) {
                    UIManager.getLookAndFeel().provideErrorFeedback(spinner);
                } catch (ParseException pe) {
                    UIManager.getLookAndFeel().provideErrorFeedback(spinner);
                }
            }
	}

        /**
         * If the spinner's editor is a DateEditor, this selects the field
         * associated with the value that is being incremented.
         */
        private void select(JSpinner spinner) {
            JComponent editor = spinner.getEditor();

            if (editor instanceof JSpinner.DateEditor) {
                JSpinner.DateEditor dateEditor = (JSpinner.DateEditor)editor;
                JFormattedTextField ftf = dateEditor.getTextField();
                Format format = dateEditor.getFormat();
                Object value;

                if (format != null && (value = spinner.getValue()) != null) {
                    SpinnerDateModel model = dateEditor.getModel();
                    DateFormat.Field field = DateFormat.Field.ofCalendarField(
                        model.getCalendarField());

                    if (field != null) {
                        try {
                            AttributedCharacterIterator iterator = format.
                                formatToCharacterIterator(value);
                            if (!select(ftf, iterator, field) &&
                                       field == DateFormat.Field.HOUR0) {
                                select(ftf, iterator, DateFormat.Field.HOUR1);
                            }
                        }
                        catch (IllegalArgumentException iae) {}
                    }
                }
            }
        }

        /**
         * Selects the passed in field, returning true if it is found,
         * false otherwise.
         */
        private boolean select(JFormattedTextField ftf,
                               AttributedCharacterIterator iterator,
                               DateFormat.Field field) {
            int max = ftf.getDocument().getLength();

            iterator.first();
            do {
                Map attrs = iterator.getAttributes();

                if (attrs != null && attrs.containsKey(field)){
                    int start = iterator.getRunStart(field);
                    int end = iterator.getRunLimit(field);

                    if (start != -1 && end != -1 && start <= max &&
                                       end <= max) {
                        ftf.select(start, end);
                    }
                    return true;
                }
            } while (iterator.next() != CharacterIterator.DONE);
            return false;
        }

        /**
         * Returns the calendarField under the start of the selection, or
         * -1 if there is no valid calendar field under the selection (or
         * the spinner isn't editing dates.
         */
        private int getCalendarField(JSpinner spinner) {
            JComponent editor = spinner.getEditor();

            if (editor instanceof JSpinner.DateEditor) {
                JSpinner.DateEditor dateEditor = (JSpinner.DateEditor)editor;
                JFormattedTextField ftf = dateEditor.getTextField();
                int start = ftf.getSelectionStart();
                JFormattedTextField.AbstractFormatter formatter =
                                    ftf.getFormatter();

                if (formatter instanceof InternationalFormatter) {
                    Format.Field[] fields = ((InternationalFormatter)
                                             formatter).getFields(start);

                    for (int counter = 0; counter < fields.length; counter++) {
                        if (fields[counter] instanceof DateFormat.Field) {
                            int calendarField;

                            if (fields[counter] == DateFormat.Field.HOUR1) {
                                calendarField = Calendar.HOUR;
                            }
                            else {
                                calendarField = ((DateFormat.Field)
                                        fields[counter]).getCalendarField();
                            }
                            if (calendarField != -1) {
                                return calendarField;
                            }
                        }
                    }
                }
            }
            return -1;
        }

	public void mousePressed(MouseEvent e) {
	    if (SwingUtilities.isLeftMouseButton(e) && e.getComponent().isEnabled()) {
		spinner = eventToSpinner(e);
		autoRepeatTimer.start();

                focusSpinnerIfNecessary();
	    }
	}

	public void mouseReleased(MouseEvent e) {
	    autoRepeatTimer.stop();	    
	    arrowButton = null;
	    spinner = null;
	}

        public void mouseClicked(MouseEvent e) {
        }

        public void mouseEntered(MouseEvent e) {
	    if (spinner != null && !autoRepeatTimer.isRunning() && spinner == eventToSpinner(e)) {
		autoRepeatTimer.start();	    
	    }
        }

        public void mouseExited(MouseEvent e) {
	    if (autoRepeatTimer.isRunning()) {
		autoRepeatTimer.stop();	    
	    }
        }

        /**
         * Requests focus on a child of the spinner if the spinner doesn't
         * have focus.
         */
        private void focusSpinnerIfNecessary() {
            Component fo = KeyboardFocusManager.
                              getCurrentKeyboardFocusManager().getFocusOwner();
            if (spinner.isRequestFocusEnabled() && (
                        fo == null ||
                        !SwingUtilities.isDescendingFrom(fo, spinner))) {
                Container root = spinner;

                if (!root.isFocusCycleRoot()) {
                    root = root.getFocusCycleRootAncestor();
                }
                if (root != null) {
                    FocusTraversalPolicy ftp = root.getFocusTraversalPolicy();
                    Component child = ftp.getComponentAfter(root, spinner);

                    if (child != null && SwingUtilities.isDescendingFrom(
                                                        child, spinner)) {
                        child.requestFocus();
                    }
                }
            }
        }

	public void focusGained(FocusEvent e) {
	}

	public void focusLost(FocusEvent e) {
            if (spinner == eventToSpinner(e)) {
                if (autoRepeatTimer.isRunning()) {
                    autoRepeatTimer.stop();	    
                }	    
                spinner = null;
                if (arrowButton != null) {
                    ButtonModel model = arrowButton.getModel();
                    model.setPressed(false);
                    model.setArmed(false);
                    arrowButton = null;
                }
            }
	}
    }


    private static class Handler implements LayoutManager,
            PropertyChangeListener, ChangeListener {
        //
        // LayoutManager
        //
	private Component nextButton = null;
	private Component previousButton = null;
	private Component editor = null;

	public void addLayoutComponent(String name, Component c) {
	    if ("Next".equals(name)) {
		nextButton = c;
	    }
	    else if ("Previous".equals(name)) {
		previousButton = c;
	    }
	    else if ("Editor".equals(name)) {
		editor = c;
	    }
	}

	public void removeLayoutComponent(Component c) {
	    if (c == nextButton) {
		c = null;
	    }
	    else if (c == previousButton) {
		previousButton = null;
	    }
	    else if (c == editor) {
		editor = null;
	    }
	}

	private Dimension preferredSize(Component c) {
	    return (c == null) ? zeroSize : c.getPreferredSize();
	}

	public Dimension preferredLayoutSize(Container parent) {
	    Dimension nextD = preferredSize(nextButton);
	    Dimension previousD = preferredSize(previousButton);
	    Dimension editorD = preferredSize(editor);

	    /* Force the editors height to be a multiple of 2
	     */
	    editorD.height = ((editorD.height + 1) / 2) * 2;     

	    Dimension size = new Dimension(editorD.width, editorD.height);
	    size.width += Math.max(nextD.width, previousD.width);
	    Insets insets = parent.getInsets();
	    size.width += insets.left + insets.right;
	    size.height += insets.top + insets.bottom;
	    return size;
	}

	public Dimension minimumLayoutSize(Container parent) {
	    return preferredLayoutSize(parent);
	}

	private void setBounds(Component c, int x, int y, int width, int height) {
	    if (c != null) {
		c.setBounds(x, y, width, height);
	    }
	}

	public void layoutContainer(Container parent) {
	    int width  = parent.getWidth();
	    int height = parent.getHeight();

	    Insets insets = parent.getInsets();
	    Dimension nextD = preferredSize(nextButton);
	    Dimension previousD = preferredSize(previousButton);	    
	    int buttonsWidth = Math.max(nextD.width, previousD.width);
	    int editorHeight = height - (insets.top + insets.bottom);

	    // The arrowButtonInsets value is used instead of the JSpinner's
	    // insets if not null. Defining this to be (0, 0, 0, 0) causes the
	    // buttons to be aligned with the outer edge of the spinner's
	    // border, and leaving it as "null" places the buttons completely
	    // inside the spinner's border.
	    Insets buttonInsets = UIManager.getInsets("Spinner.arrowButtonInsets");
	    if (buttonInsets == null) {
		buttonInsets = insets;
	    }

	    /* Deal with the spinner's componentOrientation property.
	     */
	    int editorX, editorWidth, buttonsX;
	    if (parent.getComponentOrientation().isLeftToRight()) {
		editorX = insets.left;
		editorWidth = width - insets.left - buttonsWidth - buttonInsets.right;
		buttonsX = width - buttonsWidth - buttonInsets.right;
	    } else {
		buttonsX = buttonInsets.left;
		editorX = buttonsX + buttonsWidth;
		editorWidth = width - buttonInsets.left - buttonsWidth - insets.right;
	    }

	    int nextY = buttonInsets.top;
	    int nextHeight = (height / 2) + (height % 2) - nextY;
	    int previousY = buttonInsets.top + nextHeight;
	    int previousHeight = height - previousY - buttonInsets.bottom;

	    setBounds(editor,         editorX,  insets.top, editorWidth, editorHeight);
	    setBounds(nextButton,     buttonsX, nextY,      buttonsWidth, nextHeight);
	    setBounds(previousButton, buttonsX, previousY,  buttonsWidth, previousHeight);
	}


        //
        // PropertyChangeListener
        //
        public void propertyChange(PropertyChangeEvent e)
        {
            String propertyName = e.getPropertyName();
	    if (e.getSource() instanceof JSpinner) {
		JSpinner spinner = (JSpinner)(e.getSource());
		SpinnerUI spinnerUI = spinner.getUI();

		if (spinnerUI instanceof BasicSpinnerUI) {
		    BasicSpinnerUI ui = (BasicSpinnerUI)spinnerUI;

		    if ("editor".equals(propertyName)) {
			JComponent oldEditor = (JComponent)e.getOldValue();
			JComponent newEditor = (JComponent)e.getNewValue();
			ui.replaceEditor(oldEditor, newEditor);
			ui.updateEnabledState();
			if (oldEditor instanceof JSpinner.DefaultEditor) {
			    JTextField tf =
				((JSpinner.DefaultEditor)oldEditor).getTextField();
			    if (tf != null) {
				tf.removeFocusListener(nextButtonHandler);
				tf.removeFocusListener(previousButtonHandler);
			    }
			}
			if (newEditor instanceof JSpinner.DefaultEditor) {
			    JTextField tf =
				((JSpinner.DefaultEditor)newEditor).getTextField();
			    if (tf != null) {
				if (tf.getFont() instanceof UIResource) {
				    tf.setFont(spinner.getFont());
				}
				tf.addFocusListener(nextButtonHandler);
				tf.addFocusListener(previousButtonHandler);
			    }
			}
		    if (newEditor instanceof JSpinner.DefaultEditor) {
			JTextField tf =
			    ((JSpinner.DefaultEditor)newEditor).getTextField();
			if (tf != null) {
			    if (tf.getFont() instanceof UIResource) {
				tf.setFont(spinner.getFont());
			    }
			}
		    }
		    }
		    else if ("enabled".equals(propertyName) ||
			     "model".equals(propertyName)) {
			ui.updateEnabledState();
		    }
		else if ("font".equals(propertyName)) {
		    JComponent editor = spinner.getEditor();
		    if (editor!=null && editor instanceof JSpinner.DefaultEditor) {
			JTextField tf =
			    ((JSpinner.DefaultEditor)editor).getTextField();
			if (tf != null) {
			    if (tf.getFont() instanceof UIResource) {
				tf.setFont(spinner.getFont());
			    }
			}
		    }
		}
		else if (JComponent.TOOL_TIP_TEXT_KEY.equals(propertyName)) {
		    updateToolTipTextForChildren(spinner);
		}
		}
	    } else if (e.getSource() instanceof JComponent) {
		JComponent c = (JComponent)e.getSource();
		if ((c.getParent() instanceof JPanel) &&
		    (c.getParent().getParent() instanceof JSpinner) &&
		    "border".equals(propertyName)) {

		    JSpinner spinner = (JSpinner)c.getParent().getParent();
		    SpinnerUI spinnerUI = spinner.getUI();
		    if (spinnerUI instanceof BasicSpinnerUI) {
			BasicSpinnerUI ui = (BasicSpinnerUI)spinnerUI;
			ui.maybeRemoveEditorBorder(c);
		    }
		}
	    }
    	}

	// Syncronizes the ToolTip text for the components within the spinner
	// to be the same value as the spinner ToolTip text.
	private void updateToolTipTextForChildren(JComponent spinner) {
	    String toolTipText = spinner.getToolTipText();
	    Component[] children = spinner.getComponents();
	    for (int i = 0; i < children.length; i++) {
		if (children[i] instanceof JSpinner.DefaultEditor) {
		    JTextField tf = ((JSpinner.DefaultEditor)children[i]).getTextField();
		    if (tf != null) {
			tf.setToolTipText(toolTipText);
		    }
		} else if (children[i] instanceof JComponent) {
		    ((JComponent)children[i]).setToolTipText( spinner.getToolTipText() );
		}
	    }
	}

	public void stateChanged(ChangeEvent e) {
	    if (e.getSource() instanceof JSpinner) {
		JSpinner spinner = (JSpinner)e.getSource();
		SpinnerUI spinnerUI = spinner.getUI();
		if (DefaultLookup.getBoolean(spinner, spinnerUI,
		    "Spinner.disableOnBoundaryValues", false) &&
		    spinnerUI instanceof BasicSpinnerUI) {
		    BasicSpinnerUI ui = (BasicSpinnerUI)spinnerUI;
		    ui.updateEnabledState();
		}
	    }
	}
    }
}
